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- W232467633 abstract "The brain consumes an enormous amount of energy (20%) that is disproportionate to its small size (2%). It relies on the constant delivery of oxygen and glucose to produce adenosine triphosphate, the cellular energy unit required to maintain brain cells’ functioning. Even brief loss of blood flow as a result of blockage or rupture of a cerebral blood vessel, called ischemia, leads to a sudden appearance of neurological symptoms. Stroke usually affects only one side of the brain, and the perfusion field of the affected blood vessel defines the specific pattern of sensory or motor symptoms produced. In a minority of patients (10%) blood flow is disrupted because of a vessel rupture, causing a hemorrhagic stroke. The vast majority of patients have vessel blockage as a consequence of atherosclerotic plaque, narrowing cerebral blood vessels, or distant plaque, giving rise to floating fragments called emboli that can lodge in cerebral blood vessels. The most effective treatment for stroke involves the rapid opening of an occluded vessel either mechanically or using tissue plasminogen activator (tPA), a clot-busting chemical. Time is of the essence because neurons die quickly in the absence of blood flow and tPA becomes almost ineffective 3 h after a stroke. The cellular and molecular processes underlying the ischemic cascade that culminates in neuronal cell death are well understood, particularly the importance of the excitatory neurotransmitter glutamate (Glu), which is elevated to toxic concentrations after stroke. Its binding to neuronal Glu receptors triggers a process called excitotoxicity, which causes rapid necrotic and slow apoptotic neuronal death. Approximately 800,000 new stroke cases are diagnosed annually in the United States and 200,000 patients die from it. In spite of excellent poststroke physical and occupational therapy, many of the 4 million stroke survivors live with permanent disability at a huge cost to the individual, their families, and society." @default.
- W232467633 created "2016-06-24" @default.
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- W232467633 date "2015-01-01" @default.
- W232467633 modified "2023-09-27" @default.
- W232467633 title "Cerebrovascular Infarct" @default.
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- W232467633 doi "https://doi.org/10.1016/b978-0-12-800244-5.00001-x" @default.
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